Malicious PDF — malware analysis report

Static analysis result for SHA-256 104c89bdc91c7564…

MALICIOUS

PDF

41.8 KB Created: 2020-08-26 07:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b37381e4295e86f02207d61960b01bfd SHA-1: 4de60e86b2beadd05bc6cc743b7e705a3029c03e SHA-256: 104c89bdc91c75643adbf768e9c85ec306803dd189be8e4dbff7b44a512d206f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=abbi+glines+as+she+fades+pdf
    • http://lapomevu.sjhscounseling.com/uploads/1/3/0/8/130813366/8065830.pdf
    • http://mewuw.blueridgeridingclub.org/uploads/1/3/2/6/132682347/7101715.pdf
    • http://nenigig.christhomasguitar.com/uploads/1/3/0/7/130776078/227792f35.pdf
    • http://files.huckleberryrescue.com/uploads/1/3/0/8/130813510/973c465.pdf
    • http://fugolu.backtothecityfestival.com/uploads/1/3/2/8/132814930/badan_kerafisig_xunujed_jixuxevefo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3917/8399/files/90468807769.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/jegagegob.pdf
    • https://cdn.shopify.com/s/files/1/0436/2171/2034/files/download_idman_full_crack.pdf
    • https://cdn.shopify.com/s/files/1/0437/6159/8616/files/awadhesh_premi_2019_video_dj.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/wubonafowaruvewivujovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9145/1303/files/rusux.pdf
    • https://cdn.shopify.com/s/files/1/0464/6145/2440/files/fubejuwotajoxigifigevutub.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/74091076465.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2887/files/39220202884.pdf
    • https://cdn.shopify.com/s/files/1/0437/1818/1016/files/wuxakavag.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1853/files/caritas_in_veritate_english.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/26480512713.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/50521434986.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006627.bin
b68d8f275d9e8dda4abb164db068e8416a94f88ec5ee585eede03e74df715ff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6627 5336 bytes
font_01_sfnt_off00007841.bin
02d821db434819f9a6ac89920b6f050872bbf03d0178455894baa3cae42d4c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7841 9964 bytes

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